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US 4,593,773 AGranted
Well drilling assembly
AssigneeMaritime Hydraulics AS
InventorBjarne E. Skeie
Life of this patent
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AssigneeMaritime Hydraulics AS
InventorBjarne E. Skeie
Estimating the term…
A well drilling assembly of the type in which a rotary device is attached to a drawworks, for example to the hoisting hook on a derrick, to which rotary device a hollow shaft is coupled, having a threaded end which is adapted for connection to a complementary threaded end on the drill string, and wherein a clamping/lifting means known as an elevator is suspended below the rotary device by two hanger struts. The shaft connected to the rotary device is telescopic. Outside the shaft a lifting means is provided for the lower part of the telescopic shaft. The two hanger struts which carry the elevator for one end of the pipe are means of a sliding holder known as a link hanger. The link hanger is axially movable by means of hydraulic cylinders. The lifting means for the lower part of the telescopic shaft consists of hydraulic cylinders which are constructed as a unit together with the hydraulic cylinders, the cylinders constituting piston rods for the hydraulic cylinders.
A well drilling assembly of the type in which a rotary device is suspendable by a hook of a derrick hoisting means, to which rotary device, a hollow shaft assembly is connected having a threaded end which is adapted to be coupled to the end of a drill string, which has complementary threads, and wherein a drill pipe elevator is suspended below the rotary device by two links, characterized in that the hollow shaft assembly includes an expanded section and a shaft pin which is telescopic relative to the expanded section, that externally of the hollow shaft assembly there is lifting means for moving the shaft pin telescopically relative to the expanded section, and that the elevator is suspended by two links and is axially movable in relation to the hollow shaft assembly by means of a slidable link hanger.
Dependencies are inferred from the claim text.